Welcome to the Community,
although I understand that budget is an issue, the primary focus should be on a system which meets your needs. From the selection you posted, it looks like you don't need high performance (no BBU controller, slow disks) but only disk space!?
Please provide some details about what you are planning to run on this system, how you planned backup and disaster recovery (SLA's), ...
As I assume this is going to be a production system, I wouldn't want to rely on unsupported hardware. This could work, but could also break with each update/patch you apply.
André